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Note 3 - Investment Securities (Details) - Amortized Cost and Fair Value of Securities by Contractual Maturity - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Securities held to maturity:    
Due in one year or less $ 3,801,378  
Due in one year or less 3,803,101  
Due after one year through five years 20,215,332  
Due after one year through five years 20,344,971  
Due after five years 229,657,449  
Due after five years 231,543,213  
253,674,159  
255,691,285 $ 201,113,796
Securities available for sale:    
Due in one year or less 1,858,965  
Due in one year or less 1,858,071  
Due after one year through five years 120,846,468  
Due after one year through five years 119,986,551  
Due after five years 120,340,964  
Due after five years 119,271,345  
243,046,397  
241,115,967  
Amortized Cost 325,597,000  
Fair Value 323,434,982  
Securities held to maturity:    
Amortized Cost 144,687,538  
Fair Value 143,064,681  
Residential Mortgage Backed Securities [Member]    
Securities available for sale:    
Amortized Cost 81,442,479  
Fair Value 80,670,135  
Other Securities [Member]    
Securities held to maturity:    
1,050,000 1,050,000
Securities available for sale:    
Amortized Cost 1,108,124  
Fair Value 1,648,880  
US States and Political Subdivisions Debt Securities [Member]    
Securities held to maturity:    
254,641,285 $ 200,063,796
Callable Securities [Member] | US States and Political Subdivisions Debt Securities [Member]    
Securities held to maturity:    
Amortized Cost 139,103,302  
Fair Value 140,444,117  
Callable Securities [Member] | US States and Political Subdivisions Debt Securities [Member]    
Securities held to maturity:    
Amortized Cost 16,751,793  
Fair Value 17,127,904  
Callable Securities [Member] | US Government-sponsored Enterprises Debt Securities [Member]    
Securities held to maturity:    
Amortized Cost 127,935,745  
Fair Value $ 125,936,777